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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d60a5547d8c9b809720b42259490e49c44341b5a4b89d9b3320a04871ece7e' 
  AND token = 'heOeyXnVc8K/IFQcUin2H4BpEYMnPhYAIhi8Naoq804=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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