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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569dcaef222a502ad2f836b5d1dc62fb37d37d6724348688986b6c131dfd2183' 
  AND token = 'Wl33qQRIrVczFKUROzPErkbJeByWKaemkyRRv5yjZiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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