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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f81fc990da701c60f5c17d0407489397bacc381e9fd36b7e936891fac93686c' 
  AND token = 'nLIDBn+8BrqkHDNo9qb8wulDgnSKLht5GEBIEspH3l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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