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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c8785efb35bcf7bca5aff3509289d193f6bb66359575a117b8b5bcdc59edc2' 
  AND token = 'b31fQjQIlxwRS5DlYGIY2uEE0FmoxZG1+Cm/Vk/d2/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}