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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b025c8e04ff5ad96dcb01c4e930e7a5169a6170ccc15fbd13d1cad3f083f7d47' 
  AND token = 'VbyYX/8vH2OYZPbn+efS3mYron/s7h++3eOoGI9LlTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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