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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94949dcd3387545af62a34330a7b83501f2ed2fe90e22d4bd688eb545878b623' 
  AND token = '4H9+WBe2jhRQ+bnyKelKn7vGpTj7DHlC2D31TdJgWfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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