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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f718a7aebecd44102dd0a92d7c228a68f70ea4ac93689112bb0fea7bb6784d04' 
  AND token = 'ISKi49Dt7bjMT8pHfOpI3nxcHqCAL8ESjRfY9qaDeDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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