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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11170aa2f28d39d190a4f53dcec4f326215e6802a686847dfa86879adb65dc6c' 
  AND token = 'mpXdqgRC/vRaoIUW0qV4BkroVXq2feDaSBL6UbUWd0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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