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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee42aee2adee2096c757741f45e84f0917130f04a050a8ae3edee946abca936d' 
  AND token = 'MZ+lv5z6vxeWHgG5knqhwJYVt6UUUzp5X+McVKzC1bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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