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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17afc8e279a14f2e2916bd41f7def9904f6ec18d4ee2d3865b61c09044d3ecd' 
  AND token = 'xTF8A3+v7YmkeyieUslgzRiyknr49sfXwn6AM4hFWQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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