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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3af0a92e7df298617fc4825f722f6913de7db75be3bb87079a436b1a19c4adf' 
  AND token = '/m6d/y6IvrZJozHzeD/yb14sX8SIPNWAu6GeqCvmOW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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