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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602771b3f37340ca2f1c2263fd55a66c5373e6692bb2962323eb074a2438db1a' 
  AND token = 'tLYpGv5ex6F5up718mXSBQEDhblzTzuwqRHYomuTN7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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