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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da573011e5867959b548d8f5e3dd16e979818ec5119d4ed6836a91ce5789236' 
  AND token = 'pfFXMWh1SBEpGZ660d4cMr+emMu72FqnmqbnXByA6Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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