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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb5eb033a27dfdd79436dfbe70604b731169ebb2411b3056a0bb75f42e689c6' 
  AND token = 'y48wMmHi/BkWHGH23tYkzBYkxtaVon3YIbD593O5b28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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