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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08bbc80a7df1e7e52c9e772b8bf4a939b542a8364fe4766eef2c8d15d369ab9' 
  AND token = 'OK5pnGrZbPR13w5u7jHZ3d/FHmeQbi7ZDuVdnZvYfDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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