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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ef9b17194f2e3088c8f9ea2a4986cb6b920308fa2c2fa24385ba2123333ea5' 
  AND token = 'qoO+TiXOCvvqFKXAYmaBq8CFjfpMLxFjB2ikrbXCy/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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