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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07d1b3652e84d03e13ed2bd4ee5ad3eb39530797f7caa8c4bd7641e513fe647' 
  AND token = 'LTGjbiQTAog9Q1zSn4BxgnT5d5jNhQXsHekJh6DJzKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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