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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c57d7bc85d114526d94cec3f7433b69e111dacfef4609a83810bb0ff052425' 
  AND token = '8dMvkjLP5l5Lun9iqcla8gk0UwFcoPNBpNqPwVpTatE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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