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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4169a68f993ec01916b230ec7022f3ec4a36ae02a9c46bc867628d90d0422f9' 
  AND token = 'dWK6yQhnHDApWEGmVqDNjd5gOS1L4FMsckS+lc8vNuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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