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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2696651b5f06b75992102936ed268229f1b59b305045da1c466ae416211f373c' 
  AND token = '24E9MIvxeZQ+F8aMjCCojN9vbmtCmiJ30TYLqwkEGaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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