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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e32ad29c82238540ae74c105920c7b1c6b0ef4d502280a98b585c8cc495805' 
  AND token = 'fQ0TfxDgEVC9qH79mNWzqDV8soj+ut7lgeKjVFJ5Wv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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