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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe175f36a186d182056ddf496263f224dc4e250294ac9e1a98dc2127caac5b4' 
  AND token = 'YNOvOTw6TfSOSzzCuYWxojJx3VUlc8NiECNvQnjOusw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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