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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81ff9f0600ddc71b9c669b00346d1f7dd4a1f7cd500fdd8c205d41259a3c7e7' 
  AND token = 'HG4Zv1qjHee6Pcj0v19qhHVU+dIeTc6qs8D+2gZ/aqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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