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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdc6f16ce600e4aec08a8d40c70ba8e4c40f88989b6d0af4c36644a61766be7' 
  AND token = '3AnK66n6WySvcYNoPBgVroSOvlld5KOfGbMNkqXcArM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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