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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e6e166a9db2fe82a88ef1fd5eccbad0b20d4edd815f35c2480d23a31c14d9c' 
  AND token = '9XhiJbKsdVcTUAZ9D2/XM76g5fl/Z31iOBCgJ+JLvl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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