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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc17ae4cebdcd1a1db0847373380b35e5c94b80e74b0314736b8c9caacf61673' 
  AND token = '1kke6DpewYn9sDfH9iDunMvYHgd5Vifgr8aBveR50OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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