SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631977ebdad5c4134190c2a1b9bf12e594a7df88360f88df6c06fc565fee027a' 
  AND token = 'wvSTHu9TLPMZu0hLVK1Hqjmx30yKXTxJkdbN1vcVl+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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