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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df30de97741e8f4f06364b4a9d65eeb08893f47a0dd3bc9c5fad987de1fd01ac' 
  AND token = 'sRxRin0EViU8SMkY8HxeMNM+Yv/qLJwK4g0roYnPcwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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