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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26834fa2996e430e5f4d7d27ac4eb2a9ce16b7222666fc35f90a2f49c19cdbc' 
  AND token = 'I58O5a8Aicoi2RB8+TtGyYQkRupDYnRDLW1qxDjuaus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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