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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a68a7ed58f2a330ed21c7b7407b63fa543655f785b08a6f37aa238bdeeb8be' 
  AND token = 'mptufqz3lh23K9HRarojtMGDxAp+lLa6Ngf/Gk7kM18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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