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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31839d2e64d2b054e1fe019fc8240dbead1f973d60e5e86ca52ba7967d9e8e6a' 
  AND token = 'aXI/sOjPOeWshA+9XPwKO6Gmi/OY5qt5Qtwt+rwkBRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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