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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37b1d1ebb402be49d5ec64bf53e61014fa52c7f162b3c69b57a059a9fcb58bc' 
  AND token = '+SDGp7YbNUkACKkkdbHHczH57fluuTSnX3TZzYP9EAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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