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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244bdb9f55c58540a50df74621e434666bcbcbae8f97f74dd9b94fbab7f5548d' 
  AND token = 'gsEF6dnSCRu+zSJTwNJ00Q/qv7OxNRNKHUUnXzyIddo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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