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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d788438bb9fbf6651d2f9b0a47d5af0ff1bea5812d6c0c3ba1b536f6812dfab' 
  AND token = 'oF5U+0psMbYyqjs92jJeqhc5R6QjaQU+/CMp5lnYHxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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