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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbe6277e8e8dcb0cd99d6c1d6002ce8096217a5cc387dc71c4e004717273a6f' 
  AND token = 'WUe+LMBzxbUxxA0L7Yrrco8I5PsuwiZVoM2Asw/uatA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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