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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0497d71c2e4b880c9311092d96465735dc72c418d23008bb0f899f92cca86377' 
  AND token = '0nR32awJr1X2xk2S62UA9OB9ofeJjVUbyMSI+ZD9PHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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