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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b6ca7aed661404337c9534a70cba1b52d1a03db11aa82a94b5c725f5c14196' 
  AND token = 'dArElkFFnIsQ7S3xHqNbmoe+HTp9EWIsiCxJFKekESM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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