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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcab33496f1b545da3ae1ee8814f9575792012835b5707e1a920e9b132af144' 
  AND token = '8vVwuFZZzigvYlKbMWmRbyZsSrcXQG1sWoEMTIki61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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