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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99482d26e60f44f5d618d0227e34173a9db44cf42cf283783ef1dbcc0f55a84' 
  AND token = 'l42hiefIrdbhYwBFKA8AQqYxdyOZ5Gv8R8pup9iEqlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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