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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5105f69fefdd8a0de92982c5febdf8755d5359895302c3d551c262cf5f6c1af3' 
  AND token = 'KjIATSkLhkRXCo5IQcjZabQF2P14YEw0g9RdbAitD8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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