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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a021a24d9a03bf333cd4a3384baf02e97a50ebef60a3f7ccf86a19704c1358e' 
  AND token = '/nvK81pT2AA6+iHa8llMV8W3WbPBNNdMlUd5fs/v8NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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