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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7303a25e62643be93c4de6bd4586a200758873db844b03883ce606869a120fc9' 
  AND token = 'jwO6/1B9ssXcsKP3BQZMJ5iVCJCXhsYXnwyyarwFrBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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