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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c359fb3c517c039224c32caadfcc53154ce2f1341e9bbbc597f8fa3f00e873' 
  AND token = 'LTH0Qnit8RBWhO+D8ttVO8smhJ7ug0p0SMMF1vzLvV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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