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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bb71d8424ebdadf62f18a857fc6d870acfcfbe11297186404a3b79abf76865' 
  AND token = 'op7H+NDT0oB0azH98Zcg4kO9Ge84CgJPK2fiuzj1/94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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