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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebfb48f3be9bb36a0b4a92c58adddd053fd2c287a7e6dc05ccf6a4dd28f0d62' 
  AND token = '1X5jOZHpLQDpt07tcnI+QJO2BC++KwrFcrTWUHEfpw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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