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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3771375c196e15145a1bd6558a2d5f05a4dc79bc2b7081a8bc03e87622d98519' 
  AND token = 'CXdIEoAZtaBYaiHgj54sKJP1sHUw5xflY40+YXa14PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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