SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed76b167a2a8a81c7ef8c3bd93ddb8a712b8a046f9d3123223fbb5acbb313f4' 
  AND token = 'zEGK4d3jBhKWHWzvSNdTpem4W+guPC3VHsfoXdJ92UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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