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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89799046b6e4030c95050049dbce69509ff8bc3ff58b88d662e455d794c9d3d' 
  AND token = 'ObMD7U7/h12HfxnMQiCM5twML6dbgQe5xIhCt5FA8lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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