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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f9d040cd51f526d6d6f4f13636b62cd360671516e5b44e1986d09edd39f342' 
  AND token = 'lGtTw0jlYqMyiGJ6x2s3TBnvStlcPF8CP3xR0jJaRY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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