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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c8945b9ef3997ed9e75c387129d596462615415023ab19feefe761c0d83a70' 
  AND token = '5oXxXw6oWGosURJFQL19Y2mbqTiSZSP3M8n7WQfMxKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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