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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568e12bc15b6afbab718fb9d58351db4e5a271f2a8a6d6c3c06140eb35c305f5' 
  AND token = 'tSPQwR4JWVvPHRzL/ry5tnsmUAUp/apmtQHXiI3nTC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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