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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be09cac2b7d097d155916916cb68276eacee34bf0214fcde11b9e3a05200208e' 
  AND token = 'D2arsLurTNxc9YhQERn6zj+xZgH6bI3XC+GgTxMt51U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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