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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdcf55e82d537e16fb5d2652b8bef4399f226d53490e4165a13420be7559292' 
  AND token = 'SSF9qvQNVqVzxn0MZx7LUOpSc6MoIqP/EIDr/iwuysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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