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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd342b30847f7105b5a79bdc497494f6f97a01637127f86188a2d953d56e6166' 
  AND token = 'cvbVTw1QkgEzoNVrYWwVQWVIxo6zGcoDJ3xcrKU9I4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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