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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce62534f240887f0b4fdef805b42f34acc5b365c9361e5965f5a7d18ddb909fa' 
  AND token = 'oRS43HcBxQRa7/nXxxfGbEV3l47G7Ebwv5G8fawdM3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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